Configuration 
Have a glimpse of all the existing configuration options with their corresponding default values:
ts
import VueRouter from 'unplugin-vue-router/vite'
VueRouter({
  // how and what folders to scan for files
  routesFolder: [
    {
      src: 'src/pages',
      path: '',
      // override globals
      exclude: (excluded) => excluded,
      filePatterns: (filePatterns) => filePatterns,
      extensions: (extensions) => extensions,
    },
  ],
  // what files should be considered as a pages
  extensions: ['.vue'],
  // what files to include
  filePatterns: ['**/*'],
  // files to exclude from the scan
  exclude: [],
  // where to generate the types
  dts: './typed-router.d.ts',
  // how to generate the route name
  getRouteName: (routeNode) => getFileBasedRouteName(routeNode),
  // default language for <route> custom blocks
  routeBlockLang: 'json5',
  // how to import routes, can also be a string
  importMode: 'async',
  // where are paths relative to
  root: process.cwd(),
  // options for the path parser
  pathParser: {
    // should `users.[id]` be parsed as `users/:id`?
    dotNesting: true,
  },
  // modify routes individually
  async extendRoute(route) {
    // ...
  },
  // modify routes before writing
  async beforeWriteFiles(rootRoute) {
    // ...
  },
})TIP
Highlight any of the options to see more details about it.
SSR 
It might be necessary to mark vue-router as noExternal in your vite.config.js in development mode:
ts
import { defineConfig } from 'vite'
import Vue from '@vitejs/plugin-vue'
import VueRouter from 'unplugin-vue-router/vite'
export default defineConfig(({ mode }) => ({
  ssr: {
    noExternal: mode === 'development' ? ['vue-router'] : [],
  },
  plugins: [VueRouter(), Vue()],
}))